| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.wayang.api.dataquanta.builder |
| |
| import org.apache.wayang.api.JavaPlanBuilder |
| import org.apache.wayang.api.dataquanta.{DataQuanta, DataQuantaBuilder} |
| import org.apache.wayang.api.util.TypeTrap |
| |
| /** |
| * [[DataQuantaBuilder]] implementation for [[org.apache.wayang.basic.operators.DistinctOperator]]s. |
| * |
| * @param inputDataQuanta [[DataQuantaBuilder]] for the input [[DataQuanta]] |
| */ |
| class DistinctDataQuantaBuilder[T](inputDataQuanta: DataQuantaBuilder[_, T]) |
| (implicit javaPlanBuilder: JavaPlanBuilder) |
| extends BasicDataQuantaBuilder[DistinctDataQuantaBuilder[T], T] { |
| |
| // Reuse the input TypeTrap to enforce type equality between input and output. |
| override def getOutputTypeTrap: TypeTrap = inputDataQuanta.outputTypeTrap |
| |
| override protected def build = inputDataQuanta.dataQuanta().distinct |
| |
| } |
